Capital Stock - Preferred Stock (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Oct. 31, 2021
Class of Stock [Line Items]
Dividends on preferred stock	$ 18,408,000	$ 18,438,000
Series A Preferred Stock
Class of Stock [Line Items]
Dividends on preferred stock	$ 3,000,000	$ 3,000,000
Preferred stock dividends declared (in USD per share)	$ 0.50	$ 0.50
Preferred stock, shares outstanding (shares)	5,800,000		5,800,000	5,800,000
Preferred Stock, liquidation preference	$ 145,000		$ 145,000	$ 145,000,000
Series B Preferred Stock
Class of Stock [Line Items]
Dividends on preferred stock	$ 7,000,000	$ 7,000,000
Preferred stock dividends declared (in USD per share)	$ 0.50	$ 0.50
Preferred stock, shares outstanding (shares)	13,000,000		13,000,000
Preferred Stock, liquidation preference	$ 325,000		$ 325,000
Series C Preferred Stock
Class of Stock [Line Items]
Dividends on preferred stock	$ 5,000,000	$ 5,000,000
Preferred stock dividends declared (in USD per share)	$ 0.484375	$ 0.484375
Preferred stock, shares outstanding (shares)	10,400,000		10,400,000
Preferred Stock, liquidation preference	$ 260,000		$ 260,000
Series D Preferred Stock
Class of Stock [Line Items]
Dividends on preferred stock	$ 4,000,000	$ 4,000,000
Preferred stock dividends declared (in USD per share)	$ 0.50	$ 0.50
Preferred stock, shares outstanding (shares)	8,000,000		8,000,000
Preferred Stock, liquidation preference	$ 200,000		$ 200,000